The Environmental Protection Agency (EPA) maintains a database of information on US chemical company facilities. Using this database, facility-related information such as the following can be found:
Address and other contact information
NAICS codes used for the facility
Satellite photographs of the facility (often dated)
Environmental compliance records
Released chemicals from the facility
This database is easily searched at this site (click site). With the database, information on manufacturing and other facilities (e.g. warehouses) can be found for a specific chemical company. For example, information described above can be found for five facilities belonging to the chemical company AMVAC (click here to go to AMVAC’s website). Information at the EPA’s facility database can nicely supplement a company's information provided by the company at its website and in its Securities and Exchange Commission filings.